Question

Which of the following will change their time period as they are taken to moon?

• A. A simple pendulum
• B. A physical pendulum
• C. A torsional pendulum
• D. A spring-mass system

Answer 1

Answer: (A), (B)

A physical pendulum

$T_{simplependulum}=2\pi \sqrt{\frac{l}{g}}$

$T_{phsicalpendulum}=2\pi \sqrt{\frac{mgl}{I}}$

$T_{spring}=2\pi \sqrt{\frac{m}{k}}$

$T_{torsionalpendulum}=2\pi \sqrt{\frac{k}{I}}$

As we can see only $T_{simplependulum},T_{physicalpendulum}$ depends on acceleration due to gravity. Only their time period will change on taking to moon!

Option A, B are correct!